Improve prefix handling, attention mask compatibility, and KV cache control #11
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Changed prefix mask values from 0 to 1 so virtual prefix tokens can properly participate in attention.
Added logic to concatenate prefix key/value states during training.
Enabled attention_mask in [B, T] format in addition to 4D [B, H, T_q, T_k].
Added use_cache parameter; KV cache is disabled during training.